Vulnerability-Lookup

RHSA-2026:61340

Vulnerability from csaf_redhat - Published: 2026-08-31 10:27 - Updated: 2026-09-01 07:52

Summary

Red Hat Security Advisory: dbus-broker security update

Severity

Moderate

Notes

Topic: An update for dbus-broker is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: dbus-broker is an implementation of a message bus as defined by the D-Bus specification. Its aim is to provide high performance and reliability, while keeping compatibility to the D-Bus reference implementation. It is exclusively written for Linux systems, and makes use of many modern features provided by recent Linux kernel releases. Security Fix(es): * dbus-broker: dbus-broker: session bus denial of service via EMFILE during peer setup (CVE-2026-16730) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-16730

A flaw was found in dbus-broker. When the process file-descriptor limit is reached, EMFILE/ENFILE errors during peer setup (notably SO_PEERPIDFD) are handled as fatal failures, causing the broker to exit. A local attacker who can open many connections to the user session bus can trigger this and deny service to the desktop session. Flatpak applications can reach the host session bus through the dbus proxy.

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-755 - Improper Handling of Exceptional Conditions

Affected products

Fixed 13 products

Product	Version	Remediation
Unresolved product id: BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.src	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dbus-broker-debugsource-0:36-5.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dbus-broker-debugsource-0:36-5.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dbus-broker-debugsource-0:36-5.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dbus-broker-debugsource-0:36-5.el10_2.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

9 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:61340	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2506348	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-16730	self
https://bugzilla.redhat.com/show_bug.cgi?id=2506348	external
https://www.cve.org/CVERecord?id=CVE-2026-16730	external
https://nvd.nist.gov/vuln/detail/CVE-2026-16730	external
https://github.com/bus1/dbus-broker/issues/435	external

Acknowledgments

Josh Simmons

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  "vulnerabilities": [
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      "acknowledgments": [
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        "name": "Improper Handling of Exceptional Conditions"
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          "text": "A flaw was found in dbus-broker. When the process file-descriptor limit is reached, EMFILE/ENFILE errors during peer setup (notably SO_PEERPIDFD) are handled as fatal failures, causing the broker to exit. A local attacker who can open many connections to the user session bus can trigger this and deny service to the desktop session. Flatpak applications can reach the host session bus through the dbus proxy.",
          "title": "Vulnerability description"
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          "category": "summary",
          "text": "dbus-broker: dbus-broker: session bus denial of service via EMFILE during peer setup",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A Moderate severity flaw in dbus-broker enables a local attacker or a Flatpak application within the same user session to induce a denial of service. This occurs when dbus-broker exhausts its file-descriptor table and exits instead of rejecting new connections, leading to a session bus crash and desktop disruption. Exploitation requires local access or a compromised application in the same user session.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.aarch64",
          "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.ppc64le",
          "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.s390x",
          "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.src",
          "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.x86_64",
          "BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.aarch64",
          "BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.ppc64le",
          "BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.s390x",
          "BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.x86_64",
          "BaseOS-10.2.Z:dbus-broker-debugsource-0:36-5.el10_2.aarch64",
          "BaseOS-10.2.Z:dbus-broker-debugsource-0:36-5.el10_2.ppc64le",
          "BaseOS-10.2.Z:dbus-broker-debugsource-0:36-5.el10_2.s390x",
          "BaseOS-10.2.Z:dbus-broker-debugsource-0:36-5.el10_2.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-16730"
        },
        {
          "category": "external",
          "summary": "RHBZ#2506348",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506348"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-16730",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-16730"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-16730",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-16730"
        },
        {
          "category": "external",
          "summary": "https://github.com/bus1/dbus-broker/issues/435",
          "url": "https://github.com/bus1/dbus-broker/issues/435"
        }
      ],
      "release_date": "2026-07-23T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-31T10:27:08+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
            "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.aarch64",
            "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.ppc64le",
            "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.s390x",
            "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.src",
            "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.x86_64",
            "BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.aarch64",
            "BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.ppc64le",
            "BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.s390x",
            "BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.x86_64",
            "BaseOS-10.2.Z:dbus-broker-debugsource-0:36-5.el10_2.aarch64",
            "BaseOS-10.2.Z:dbus-broker-debugsource-0:36-5.el10_2.ppc64le",
            "BaseOS-10.2.Z:dbus-broker-debugsource-0:36-5.el10_2.s390x",
            "BaseOS-10.2.Z:dbus-broker-debugsource-0:36-5.el10_2.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:61340"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
          "product_ids": [
            "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.aarch64",
            "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.ppc64le",
            "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.s390x",
            "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.src",
            "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.x86_64",
            "BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.aarch64",
            "BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.ppc64le",
            "BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.s390x",
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            "BaseOS-10.2.Z:dbus-broker-debugsource-0:36-5.el10_2.s390x",
            "BaseOS-10.2.Z:dbus-broker-debugsource-0:36-5.el10_2.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.aarch64",
            "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.ppc64le",
            "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.s390x",
            "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.src",
            "BaseOS-10.2.Z:dbus-broker-0:36-5.el10_2.x86_64",
            "BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.aarch64",
            "BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.ppc64le",
            "BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.s390x",
            "BaseOS-10.2.Z:dbus-broker-debuginfo-0:36-5.el10_2.x86_64",
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            "BaseOS-10.2.Z:dbus-broker-debugsource-0:36-5.el10_2.s390x",
            "BaseOS-10.2.Z:dbus-broker-debugsource-0:36-5.el10_2.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "dbus-broker: dbus-broker: session bus denial of service via EMFILE during peer setup"
    }
  ]
}

CVE-2026-16730 (GCVE-0-2026-16730)

Vulnerability from cvelistv5 – Published: 2026-07-24 11:26 – Updated: 2026-08-31 14:15

Title

Dbus-broker: dbus-broker: session bus denial of service via emfile during peer setup

Summary

Severity

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-24 14:47 UTC

CWE

CWE-755 - Improper Handling of Exceptional Conditions

Assigner

redhat redhat root

References

5 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:61340	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:61355	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-16730	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2506348	issue-trackingx_refsource_REDHAT
https://github.com/bus1/dbus-broker/issues/435

Impacted products

4 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:36-5.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:28-9.el9_8 , < * (rpm) cpe:/o:redhat:enterprise_linux:9::baseos
Red Hat	Red Hat Hardened Images	cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Date Public

2026-07-23 00:00

Credits

Red Hat would like to thank Josh Simmons for reporting this issue.

Show details on NVD website

JSON

To clipboard

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  "containers": {
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                "id": "CVE-2026-16730",
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                    "Technical Impact": "partial"
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-24T14:47:59.239150Z",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

RHSA-2026:61340

CVE-2026-16730 (GCVE-0-2026-16730)

Tags

Sightings

Nomenclature